Is ViVid Strike! Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2017 · 3 episodes · PG-13 - Teens 13 or older
Action, Drama, Martial Arts
Episodes 5.5, 5.75, and 13 bundled with the second, third, and fourth Blu-ray volumes of ViVid Strike!
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